Given a real number between 0 and 1 (e.g., 0.72) that is passed in as a double, print the binary representation. If the number cannot be represented accurately in binary with at most 32 characters, print "ERROR."

CC150-5.2.java

package POJ;

public class Main{
 
	/**
	 * 
	 * 5.2 Given a real number between 0 and 1 (e.g., 0.72) that is passed in as a double, print the binary 
	 * representation. If the number cannot be represented accurately in binary with at most 32 characters, print "ERROR."
	 * 
	 * 
	 */
	public static void main(String[] args) {
		Main so = new Main();
		System.out.println(so.printBinary(0.5));
	}

	public String printBinary(double num) {
		if (num >= 1 || num <= 0)
			return "Error";
		StringBuilder result = new StringBuilder();
		result.append("0.");
		while (num > 0) {
			if (result.length() >= 32)
				return "Error";
			double r = num * 2;
			if (r >= 1) {
				result.append("1");
				num = r - 1;
			} else {
				result.append("0");
				num = r;
			}
		}
		return result.toString();
	}
}